Home Forums Hunting & Shooting Gunsmithing 7-mm-08 accruacy problem

I have a weatherby mkv fibermark stainless 7-mm-08 that shoots large groups 2.5" at 1ooyds. It often shoots 2 shots touching and throws one opening up the groups however I never know which bullet out of the three it's going to throw. Where should I look first the bedding in the stock and what should I looking for?
Here is a list of powder and bullets I have tride.
120gr nosler bt's H 4895
140gr nosler bt's H 4895
139gr hornady sst H4895
139gr hornady btsp win 760
139gr hornady gmx win 760
154gr hornady interlock soft points both h 4895 and win 760
all loads listed shoot the same groups.
thanks

COAL? Any chance you tried seating depth changes?


Woofer

Bedding...

yes I havetried seating depth.
thanks

Yup.

Id try another scope, bedding is overrated.

Bedding is NOT overrated, but I agree with the scope comment. I just went through the identical rodeo as you describe. Save yourself some time/$ and try a different scope to start...
https://www.24hourcampfire.com/ubbth..._Rem_700_bolt_lugs_uneven_co#Post5667108

Check the scope mounting screws to make sure they are all tight. Recently had a friends Rem 700 that was all over the target. Scope mount was loose.

Also, my Rem 700 seems to like H335 with Hornady 139 SPBT bullets. Next preference is 4895.

You know not of what you speak. Talk to a BR, F-Class, etc. shooter and ask them if the rifle(s) are bedded. Folks even bed AR-15's and it's not just because. I can assure you of that.

2.5"@100yards is not good bedded or not. Run 43-45 grains of Varget with your 120BT's and see what happens. This is a very common load guys shoot thru a 7mm-08.

Why would he have to bed a rifle thats pillar bedded already, read the specs on this rifle. C.T.S.S.
http://www.weatherby.com/product/rifles/markv/fibermark

I dont see that the Mark V was chambered in 708 though, Im thinking this rifle is a Vanguard.

OK, this is the only Mark V that comes in 708 and it has a B&C stock with Aluminum bedding block, if thats the case it dont need any bedding, I dont care what any F-class shooter says.

http://www.weatherby.com/product/rifles/markv/ultralight

well i have the same gun in a .308 that was a bit picky in shooting style and loads. i than skim bedded it and floated the barrel now as long as you don't get it hot it shoots very-very well well under 1/2in and alot of groups in the 1/4in. range.

Two in and one out can be a mechanical thing. Barrel may be full of copper, wind has a major effect on groups, table techniques, etc.

A few months ago, someone wrote an article about odd things that can affect accuracy. IIRC, the article was by JB (Mule Deer) and was in a 'Rifle' magazine.

The article described several things that can cause this. One I remember was the magazine box contacting the bttom of the action. There were many others.

My guess is that you find the magazine, and probably the solution to your problem is in the article. One guess would be the muzzle crown. Another would be the magazine/floorplate putting stress on the action.

Pillars do not ensure the action is straight or stress free. It only takes about 20 in/lbs of torque to flex an action. Most pillar bedded rifles are torqued in the range of 50 in/lbs.

Pillars keep the stock from being "crushed" or compressing at the tang and receiver. Skim bedding, done correctly, will keep the action from flexing as it is a tight fitting reverse imprint of the action.

All of my rifles are glass bedded and free floated. Each and every one will shoot to within 1" of where it was sighted in prior to taking the rifle apart for cleaning. Another example of this is my Dad's Rem 700 in .280 Rem with a FWT Douglas barrel. He sent the stock to me for painting, I returned it last week, he screwed it back on at 40 in/lbs. We went to the range and the rifle shot to the exact same POI with his 140 gr. Accubond load, 2" high at 12 o'clock.

The best reason to bed one is that it will give you the opportunity to develop accurate loads with a little effort as possible. In one word, consistency. That's the reason BR shooters bed (actually glue in) their barreled actions.

Ive got a few H-S stocks and I torque them at 65in lbs, id think a pillar bedded stock would be the same. Only my 700VS 223 is fully bedded by Chris Matthews, only reason for that was to align the barrel a bit better with the stock since Remington screwed in the barrel a bit to the left. It doesnt shoot any better after it was bedded, but Chris did a very nice job on that H-S stock. The rifle did take an antelope @376yds with one shot thru the heart.

Wow, I'm so unimpressed!

I just recently coated a Weatherby from the customs shop that was "bedded". Stock also had the aluminum block. Big ugly glob of epoxy in the bottom of the lug area.

No release agent was used at all. I had to use a little heat to get the barreled action out of the stock. Not impressed at all, bedding does matter if you want a repeatability and consistency. Coupled with pillars done right it's a win/win situation that can't hurt anything for sure.